North Penn School District
Elementary Math Parent Letter
Grade 6
Unit 2 – Chapter 4: Ratios and Rates
Examples for each lesson:
Lesson 4.1
Lesson 4.2
Lesson 4.3
More information on this strategy is available on Animated Math Model #15.
Lesson 4.4
More information on this strategy is available on Animated Math Model #15.
Lesson 4.5
Lesson 4.6
More information on this strategy is available on Animated Math Model #15.
Lesson 4.7
More information on this strategy is available on Animated Math Model #15.
Lesson 4.8
Vocabulary
Equivalent ratios – ratios that name the same comparison
Rate – a ratio that compares two quantities measured in different units
Ratio – a comparison of two quantities using division
Unit rate – a rate in which the second quantity in the comparison is one unit
Coordinate plane – a plane formed by a horizontal line called the x-axis and a vertical line called
the y-axis
Equivalent fractions – two or more fractions that name the same amount
Ordered pair – a pair of numbers that can be used to locate a point on the coordinate plane
x-coordinate – the first number in an ordered pair, which tells the distance to move right or left
from (0, 0)
y-coordinate – the second number in an ordered pair, which tells the distance to move up or
down from (0, 0)